M306H7MG-XXXFP Datasheet, PDF (324/329 Pages) Renesas Technology Corp – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with DATA ACQUISITION CONTROLLER

M306H7MG-XXXFP/MC-XXXFP/FGFP
19. USAGE NOTES
19.12.4 Precautions when sub clock starts
When a signal “H” is applied to the STARTB pin and a reset is deserted, a sub clock divided-by-8 becomes a
CPU clock.
When using in this condition, set the CM07 bit in the CM0 register to “1” and switch the CPU clock to sub
clock (no division).
19.12.5 Power supply noise and latch-up
In order to avoid power supply noise and latch-up, connect a bypass capacitor (more than 0.1µF) directly
between the VCC pin and VSS pin, VDD2 pin and VSS2 pin, AVCC pin and AVSS pin using a heavy wire.
And, connect VSS (GND) to the TEST1 pin (93 pin) via the capacitor (more than 0.1µF).
19.12.6 When oscillation circuit stop for data slicer
Expansion register XTAL_VCO, PDC_VCO_ON,VPS_VCO_ON is set at “L”, when the data slicer is not
used, and the oscillation is stopped. When starting oscillation again, set data at the folowing order.
(a) Set expansion register XTAL_VCO = “H.”
(b) Set expansion register PDC_VCO_ON, VPS_VCO_ON = “H.”
(c) 60 ms or more is a waiting state (stability period of internal oscillation circuit + data slice prepara tion).
* To operate slice RAM, set expansion register XTAL_VCO = “H.”
Access the memories after wating for 20 ms certainly when resuming synchronous oscillation from the off
state.
19.12.7 When operation start from stand-by mode (clock is stopped)
Set up an extended register as follows in standby mode.
(a) Set extended register XTAL_VCO, PDC_VCO_ON, and VPS_VCO_ON as “L.”
When you return to an oscillation state from a clock oscillation stop, set up as the notes of the oscillation circuit
stop for data slicers.
19.12.8 Notes concerning address 3616 expansion registers and address 3E16
data setting
Please do not change data after setting initial data to the corresponding addresses 3616 and 3E16 interrupt
control bits when you use the interrupt of the expansion feature (SLICEON, remote control, HINT, clock timer,
and remote control transmission interrupt).
Rev.2.10 Oct 25, 2006 Page 324 of 326
REJ03B0152-0210